JSON Formatter & Validator
Format, validate and minify JSON with an editor built for developers. Debugging an API response dumped on one endless line — or hunting the missing comma in a 500-line config — is painful without the right tool. Paste your JSON here and get instant, colorized pretty-printing with your preferred indentation (2, 4 spaces or tabs). Invalid JSON? You'll see the exact error message with a line and column number instead of a generic failure. Need it compact again? One click minifies it. Everything runs locally in your browser, so API responses and config files stay completely private.
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How to format JSON online for free
- 1
Paste or type your JSON into the editor — or drop a .json file to load it.
- 2
Click “Format” to pretty-print with your chosen indentation, or “Minify” to strip all whitespace.
- 3
Check the validation banner — valid JSON gets a green confirmation, invalid JSON shows the exact error location.
- 4
Copy the result or download it as a .json file.
Why use this json formatter tool?
Precise error reporting
Syntax errors show the parser's message with line and column numbers, so a stray comma is found in seconds, not minutes.
Flexible indentation
Pretty-print with 2 spaces, 4 spaces, or tabs to match your project's style guide exactly.
Beautify & minify
Switch between human-readable formatting and the smallest possible payload for production use.
Private by design
Formatting and validation happen on your device. Sensitive API responses and config files never touch a server.